I suspect that all this talk about prices is a bit of a red herring. BH will advertise the flats at high prices to make the development seem 'prestigious', but my guess is they would accept offers way below the asking price.
My other guess is that they want more 1-beds so they can offload them onto buy to let or buy to leave property developers.

I think it is terrible that the building work will be mothballed - but get used to it everyone, it is happening right across the country.